The crystal structure of Δ,Δ-μ-hydroxo-μ-sulfato-bis[bis(ethylenediamine)chromium(III)] dithionate hydrate

Structural and magnetic characterization of the chromium(III) dimer cis-[hydroxotetraamminechromium(III)-.mu.-hydroxo-pentaamminechromium(III)] dithionate trihydrate, [(NH3)5Cr(OH)Cr(NH3)4(OH)](S2O6)2.3H2O

“…The bridging unit is not significantly asymmetric, the Cr-(l)-O(l) and Cr(2)-0(1) bond lengths of 1.962 (8) and 1.989 (8) Á comparing well with the value of 1.974 (3) Á reported for the symmetric acid rhodo ion17 and with the values of 1.986-1.990 Á observed in the related ethylenediamine complexes. 37,38 The Cr(l)-0(1)-Cr(2) bridging angle of 142.8 (5)°i n this complex is significantly smaller, however, than the values of 154, 158.4 (7), and 166 (1)°reported for the corresponding angle in the symmetric acid rhodo ion, 0 Other parameters included were a temperature-independent susceptibility term besides the standard diamagnetic corrections (results (40-100) X 10™6 cgsu) and monomeric impurities (0-0.3 mol %). b The g factors obtained depend on the elemental analyses, g2 being proportional to the formula weight assumed.…”

The crystal structure of Δ,Δ-μ-hydroxo-bis[bis(ethylenediamine)hydroxochromium(III)] triperchlorate monohydrate

“…Binuclear Cr III compounds with OH as a bridging ligand have been the subject of studies at this laboratory (Springborg & Toftlund, 1975,b, 1979Springborg & Sch~iffer, 1976a,b, 1978Kaas, 1976Kaas, , 1979. The present structure analysis was initiated to establish the structure of the monohydroxo-bridged product formed in the reversible ring opening of the A,A-di-~-hydroxo-bis-[bis(ethylenediamine)chromium(III)] cation (Springborg & Toftlund, 1975.…”